Modulation of Three Dimensional Photonic Band Gap in Visible Region

Abstract:

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Three dimensional (3D) SiO2 photonic crystals films were fabricated on quartz substrate
by vertical deposition method. The effects of various preparation parameters on optical properties
were studied by optical transmission measurements. Bragg reflection on parallel sets of (111) planes
were observed in all the samples. The center wavelength of [111] photonic band gap (PBG) varied
from 450 nm to 680 nm with the increasing sphere size. For a given sphere size, the (111) Bragg
reflection of as-deposited sample shifted towards lower wavelengths as the sintering temperature T
increased. The role of evaporation temperature on the optical properties of the film was also
investigated. The PBG can be correspondingly modulated in visible region by changing various
preparation parameters.

Abstract: The concept of photonic crystal and photonic band gap were described in this paper, and the relationship among the transmissivity and wavelength of incident light, layers of thin films, optical thickness of thin films and refractive index of the materials were discussed. A model of the one-dimensional photonic crystal was established by using the transfer matrix method. According to this model, the heat adjustment of room temperature can be realized by using the photonic crystal glass.

Abstract: Temperature tunable photonic crystals were fabricated based on liquid-infiltrated inverse opal films which were prepared by Tb3+ doped SiO2 with a sol-gel method. The photoluminescence was investigated with the photonic band gap shift tuned by temperature. The results show that obvious suppression of spontaneous emission occurs when the photonic band gap overlaps with the Tb3+ emission band, while enhancement of the emission is observed if the emission band shifts at the edge of the band gap.